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If x(t-5)=0 for t<5 = A for t>=5, the signal is ___________

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If x(t-5)=0 for t<5 = A for t>=5, the signal is ___________

(a) Causal

(b) Symmetric

(c) Linear, Time Invariant and Causal

(d) Cannot be determined

I have been asked this question during an online interview.

This interesting question is from Operations on Signals topic in portion Digital Signal Processing of MATLAB

1 Answer

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Right option is (a) Causal

For explanation I would say: The signal given to us is delayed by 5 units in time. If we advance the signal by 5 units, the signal amplitude is 0 for t<0 but A for t>=0. Hence, the signal will be causal.

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